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Beamcon III, a Linearity Measurement Instrument for Optical Detectors.

Ambler Thompson1, How-More Chen2

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.

Journal of Research of the National Institute of Standards and Technology
|July 5, 2023
PubMed
Summary
This summary is machine-generated.

Beamcon III enhances detector linearity measurements using a beam addition method. This new instrument achieves high accuracy, with a silicon photodiode system showing linearity within 0.054% over nine decades.

Keywords:
beam addition methodlinearityoptical radiation detectorssilicon photodiode

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Area of Science:

  • Detector metrology
  • Optical physics
  • Instrumentation engineering

Background:

  • Accurate linearity measurements are crucial for detector calibration and performance assessment.
  • Previous instruments faced limitations in stray radiation reduction and dynamic range.
  • The National Institute of Standards and Technology (NIST) detector metrology program requires advanced measurement capabilities.

Purpose of the Study:

  • To describe the design and operation of Beamcon III, an advanced linearity measurement instrument.
  • To detail the improvements incorporated into Beamcon III for enhanced measurement accuracy.
  • To present the linearity performance of a silicon photodiode-amplifier detector system using Beamcon III.

Main Methods:

  • Utilized the beam addition method for linearity assessment.
  • Employed three well-baffled chambers to minimize stray radiation.
  • Determined a polynomial response function using a least-squares method.
  • Operated the instrument over an extended dynamic range.

Main Results:

  • Beamcon III significantly reduces stray radiation to extremely low levels.
  • The instrument provides a larger dynamic range compared to previous systems.
  • A silicon photodiode-amplifier detector system demonstrated linearity within 0.054% (2σ estimate).
  • This linearity was confirmed over nine decades of signal.

Conclusions:

  • Beamcon III represents a significant advancement in detector linearity metrology.
  • The instrument's design improvements enable highly accurate and reliable measurements.
  • The demonstrated linearity performance of the silicon photodiode system validates the effectiveness of Beamcon III.